Low [CVE-2026-52686] DNSSEC validation bypass due to unsigned wildcard expansion proofs
This low-severity Red Hat Linux advisory covers CVE-2026-52686.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
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Summary
The issue is a DNSSEC validation bypass where wildcard expansion proofs (NSEC/NSEC3 records) are accepted without signature validation when the wildcard answer is a CNAME or DNAME record. A flaw was found in pdns-recursor.
This vulnerability allows a remote attacker to bypass DNSSEC (Domain Name System Security Extensions) validation. This can lead to an attacker providing forged DNS responses, potentially resulting in information integrity issues.
Red Hat Product Security has determined that this vulnerability does not affect any currently supported Red Hat product. This assessment may evolve based on further analysis and discovery.
For more information about this vulnerability and the affected packages, refer to the linked references. Red Hat severity: Low — CVSS 3.7 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N).
Weakness: CWE-347.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · medium-confidence parse· fetched 1 day ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 1 day ago·verify at source
Mitigation
The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 1 day ago·verify at source
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